62936-31-6Relevant articles and documents
Three-Component Activation/Alkynylation/Cyclocondensation (AACC) Synthesis of Enhanced Emission Solvatochromic 3-Ethynylquinoxalines
Merkt, Franziska K.,H?wedes, Simon P.,Gers-Panther, Charlotte F.,Gruber, Irina,Janiak, Christoph,Müller, Thomas J. J.
, p. 8114 - 8125 (2018/04/02)
2-Substituted 3-ethynylquinoxaline chromophores can be readily synthesized by a consecutive activation–alkynylation–cyclocondensation (AACC) one-pot sequence in a three-component manner. In comparison with the previously published four-component glyoxylation starting from electron-rich π-nucleophiles, the direct activation of (hetero)aryl glyoxylic acids allows the introduction of substituents that cannot be directly accessed by glyoxylation. By introducing N,N-dimethylaniline as a strong donor in the 2-position, the emission solvatochromicity of 3-ethynylquinoxalines can be considerably enhanced to cover the spectral range from blue–green to deep red–orange with a single chromophore in a relatively narrow polarity window. The diversity-oriented nature of the synthetic multicomponent reaction concept enables comprehensive investigations of structure–property relationships by Hammett correlations and Lippert–Mataga analysis, as well as the elucidation of the electronic structure of the emission solvatochromic π-conjugated donor–acceptor systems by DFT and time-dependent DFT calculations with the PBEh1PBE functional for a better reproduction of the dominant charge-transfer character of the longest wavelength absorption band.
Directing-group-assisted copper-catalyzed olefinic trifluoromethylation of electron-deficient alkenes
Feng, Chao,Loh, Teck-Peng
supporting information, p. 122414 - 122417 (2013/12/04)
Assistance provided: The directing group in the title reaction not only activates the substrates but also allows the stereospecific formation of cis-trifluoromethylated products. The reaction is operationally simple and tolerates a wide variety of functional groups, thus providing an efficient method for the stereoselective synthesis of β-CF3-functionalized acrylamide derivatives. Copyright
CYCLOOXYGENASE-2 INHIBITORS
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Page/Page column 8-9, (2009/01/20)
The present invention relates to lH-pyrrole or furan-2,5dione derivatives and a pharmaceutical composition for inhibiting cyclooxygenase-2(COX-2), more specifically for treating or preventing inflammation, an allergic disorder, inflammatory dermatosis, an immunologic disorder, a neurodegenerative disorder, arthritis, pain or fever comprising the same.